High-performing farms exploit reproductive potential of high and low prolific sows better than low-performing farms

Table 1 Reproductive data for sows on 98 farms

			Range
	N	Mean ± SEM	Minimum	Maximum
Lifetime performance measurements
Number of parity at removal	85,096	4.8 ± 0.01	1	11
Gilt age at first-mating, days old^a	78,884	251.3 ± 0.15	160	400
Lifetime number of piglets born alive	85,096	57.3 ± 0.11	0	129
Lifetime number of piglets weaned	85,096	49.9 ± 0.09	0	103
Annualized lifetime piglets weaned per sow	85,096	23.9 ± 0.02	0	74^c
Lifetime non-productive days	85,096	84.8 ± 0.17	0	289
Parity performance measurements
Parity	419,290	2.4 ± 0.01	0	6
Number of piglets born alive^b	352,457	12.0 ± 0.01	0	26
Number of piglets weaned^b	352,408	10.5 ± 0.01	0	26
Lactation length, days^b	348,032	23.5 ± 0.01	14	41
Weaning-to-first-mating interval, days^b	349,038	5.9 ± 0.01	0	35
Re-service interval, days	37,617	37.5 ± 0.14	11	150

^aThe remaining records (85,096-N) were regarded as missing records
^bThe remaining records (419,290-N) were regarded as missing records
^cThis is a value based on the maximum number of piglets weaned by a sow in parity 1, adjusted to an annualized equivalent (some sows were culled at parity 1, meaning that there are no subsequent data for parity 2 or higher)

ISSN: 2055-5660